It seems pretty coincidental Putin's plane shows up (near twin to MH17, is that why they chose Malaysian airlines?). Think about it. Itar-Tass announces Ukraine airspace closed, MH17 is shot down by Buk missiles Kiev delivered to Dontesk yesterday then announces Ukraine separatists did it with help from Russia.

If Putin flies through the same airspace shortly after, he can claim an assassination attempt by Kiev. Where's NATO's cassus beli then?